Python Pillow up to 12.x FlashPix JPEG-tile decoder ImagingJpegDecode buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in Python Pillow Pillow up to 12.x. The affected element is the function ImagingJpegDecode of the component FlashPix JPEG-tile decoder. Executing a manipulation can lead to buffer overflow. This vulnerability is registered as CVE-2026-112398. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Python Pillow Pillow up to 12.x. This vulnerability affects the function ImagingJpegDecode of the component FlashPix JPEG-tile decoder. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution. This issue is fixed in version 13.0.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-112398 since 10/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 13.0.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• Python Pillow

Name

• Pillow

Version

• 12.x

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

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